Question
Wed December 21, 2011 By: Shobhit Arjwani

sir , in a moving coil galvanometer it is said that concave magnetic poles provide radial mag. feild which makes angle alpha = 90 but actually angle between area vector of coil an mag. field is not 90....as in fig?

Expert Reply
Thu December 22, 2011
in this figure we see that the magnetic fld is from north to south pole ie on the plane of the coil.
area vector is always perpendicular to the plane. so area vector is perpendicular to magnetic fld.
so torque ?= nIBA     as sin 90=1
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